Linear Dynamics study velocity type?

I am running a linear dynamics study, where I am tracking the four workflow sensitive sensors. When I 'Define Response Graph' for 'VRES velocity', what velocity is this? I it RMS? Is it the maximum (center wave velocity)? Is it mean velocity? I can't seem to see anywhere were this could be selected. A very simple question I know, and I'm sure someone will be able to answer it easily!

If your units are distance/time then it is the RMS value of the velocity. How ever if your units are (distance/time)/frequency^2 then you are obtaning the value of the Power Spectral Density [which is in units of gRMS, Root Mean Square of the acceleration input signal in units of g's] function which takes the efect of the frequency of vibration that generates that velocity [e.g. 5mm/sec at 5Hz is very different from 5mm/sec at 500Hz].

To activate de PSD option just check the "Show PSD value" option.

If you want my opinion, depending on what you want to check with the simulation PSD plots are way more valuable than RMS plots. Particularly useful when you are doing random vibration analysis.

If your units are distance/time then it is the RMS value of the velocity. How ever if your units are (distance/time)/frequency^2 then you are obtaning the value of the Power Spectral Density [which is in units of gRMS, Root Mean Square of the acceleration input signal in units of g's] function which takes the efect of the frequency of vibration that generates that velocity [e.g. 5mm/sec at 5Hz is very different from 5mm/sec at 500Hz].

To activate de PSD option just check the "Show PSD value" option.

If you want my opinion, depending on what you want to check with the simulation PSD plots are way more valuable than RMS plots. Particularly useful when you are doing random vibration analysis.

Thanks so much Gian!Yes I was hopinig it was RMS by default, this is the units I want as I'm comparing the rms velocity at certain points to ensure they don't exceed limits as set out by ASHRAE (http://www.mne.psu.edu/lamancusa/me458/ashrae_isolation.pdf). If you happen to have any links/ information about how to determine if a certain amount of vibration is acceptable or about the acceptable distance between natural and operating frequencies, let me know! Currently I have a natural frequency at 17.86 Hz with MPF of 29%, with the operating frequency at 6Hz. Anyone know if this is acceptable?

In previous work experience I used to check out everything with the MIL-STD-810G, which happens to be the standard they teach you in the SolidWorks Simulation Premium: Dynamics training, but we didn't measure distances between natural and operating frequencies.

I'm sure ASME or SAE has a standard test and recomendations for this kind of problems.